Circuit Project Electronic

PWM motor controller Image circuit pdf file, LM339,LM324 part.
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My Friend want circuit Pulse Generator Oscillator 32.768KHz by watch crystal.
I see to this site Good web nice idea and circuit easy.
http://ourworld.compuserve.com/homepages/Bill_Bowden/
page11.htm#oscilate.gif 
use  watch crystal and normol electronic part.
IC not gate digital IC 4049 and Transistor.

Comparator Oscillator Circuit by LM311 or LM339
Comparators can also be used as oscillators but are not well suited for this type of application.

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